The Prada phone, known as the KE850, will have a touch screen as its front panel and has a simple, clean edged design. It's seen as a direct challenger to iPhone as it looks similar and was announced shortly before Apple's highly anticipated mobile.

Jajah boasts that after one year it has two-million members, a growth the company likes to boast is faster than internet telephony stalwarts Skype .

Jajah also claims making calls using its service is 91 per cent cheaper than on a standard mobile contract with Vodafone, 67 per cent with Orange, 87 per cent with T-Mobile and 88 per cent with O2.